Knockout Kings 2000

Note: This game is also titled Box Champions 2000.

Big gloves:
Pause game play and press C-Up, C-Down, C-Up(2), C-Down. The sound of a bell will confirm correct code entry. Enter the code again to return to normal.

Big head mode:
Pause game play and press C-Left, C-Right, C-Left(2), C-Right. The sound of a bell will confirm correct code entry. Enter the code again to return to normal.

Hint: Super punch:
Press A + B + R and the direction to punch while the glove in the upper corner is flashing.
Information in this section was contributed by HTOWNMASTA.

To get super gloves and make them glow, press A + B when you have a letter of "RUMBLE". Different boxers will do different stances.
Information in this section was contributed by tuesday.

Hint: Easy knockdown:
Fill your meter then press R + L + A or B to knock down your opponent regardless of whether he is blocking.

Hint: Moves:
Information in this section was contributed by Tito281 and KCT.

Punch: Press A or B.
Strong left-handed punch: Press R + B.
Strong right-handed punch: Press R + A.
Jab: Press A or B + Analog-stick Up.
Jab: Press A or B + Right.
Jab: Press A or B + Analog-stick Down.

Hint: Easy training:
Select "Offense" in training mode. Use the following moves to hit the blue opponent: Down + A, Down + A, Down + B, Down + B. Repeat until he has been hit thirty times.

Select career mode and choose Muhammud Ali. Go to training after every match and repeatedly press C-Up when next to the trainer.

Hint: Restore energy:
Move away from your opponent, hold Z and sweep the Analog-stick in circles. Also try tapping Z repeatedly without moving the Analog-stick.
Information in this section was contributed by gamewyrm.

Hint: Easy attribute points:
Select career mode and intentionally lose every fight so you can train to earn more attribute points. Once this has been done ten to fifteen times, all your attribute points should be at the top. This will allow you to easily win your remaining matches, and earn the championship after about five fights. Note: Every time you lose a fight, you can train again.
Information in this section was contributed by ShaggyManG.